<?php

/**
 * Handler that allows rendering of fields to be links to the term pages. Taken from views_handler_field_node.inc.
 */
class term_fields_handler_field extends views_handler_field {

    var $term_fields_field;

    /**
     * Constructor to provide additional field to add.
     */
    function construct() {
        parent::construct();
        $this->additional_fields['tid'] = 'tid';

        $fields = term_fields_get_fields('fields');
        $this->term_fields_field = array_key_exists($this->definition['term_fields_field_name'], $fields) ? $fields[$this->definition['term_fields_field_name']] : NULL;
    }

    function option_definition() {
        $options = parent::option_definition();
        $options['link_to_term'] = array('default' => FALSE);
        return $options;
    }

    /**
     * Provide link to term option.
     */
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['link_to_term'] = array(
            '#title' => t('Link this field to its term'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['link_to_term']),
        );
    }

    /**
     * Render whatever the data is as a link to the term.
     *
     * Data should be made XSS safe prior to calling this function.
     */
    function render_link($data, $values) {
        if (!empty($this->options['link_to_term']) && $data !== NULL && $data !== '') {
            return l($data, 'taxonomy/term/' . $values->{$this->aliases['tid']}, array('html' => TRUE));
        } else {
            return $data;
        }
    }

    function render($values) {
        return $this->render_link(check_plain($values->{$this->field_alias}), $values);
    }

}